Automatic resistance-regulator for telegraph-lines and the like.



E. BELIN. AUTQMATIG RESISTANCE REGULATOR FOR TELEGRAPH LINES AND THE LIKE.

APPLIOATION FILED DBO. 20, 1911.

Patented Apr. 8, 1913.

M @DLMM 73M MM 3 Wk fm Theneedle of tached thereto a pair of'contacts which are EDOUARD BELIN, PARIS, FRANCE.

.AUTOMATIG nestsmaven-Rntrimaran roe TELEGRAPH-Lines arm can LIKE.

Specification of hatter-s Pat ent.

- ratemea Apr. aisle.

Application filed December- 2'0, 1911. Serial E0 acacia To all whom it may concern: Be-it known that I, EDOUARD Benin a citizen of theRepublic of France, residing at Paris, in the Republic of France, have in-1 vented certain new and useful Improvements in Automatic Resistance-Regul2itors for Telegraph-Lines and the Like, of which the following is as ecification; I

' This invention re ates to means for'autoinatically regulating the resistance of telephone or-telegraph lines or the like; These.- ineans conslst'essentially 1n .the use or an additional variable resistance the slider 01" which is moved to and fro by means of a re lay and controlledhy a galvanometer arranged in series with'the line." Such derice is of. particular importance in connection with signals which depend upon the strength of the current tor-their nterpolat tion. 7

the galvnno ncter has at-j adapted. to close one orlothe'rof twojcircuits .Wh1ch operate a relay forswltchmg on or oil the current to ja'slna-ll electric motor. The latter is-connected by's'uitable gearing to'the slider of the,'adjustable resistance that the latter is increased or decreased according' asthe galvanoineter brings one or both of its contactsinto-operation.

The accoin an in' drawin s illustrate iliagrannnatically the circuits of one manner of carrying out the invention.

The line consists of a wire 1, a resistance .39 w re 2 leading to the earth plate 3.

The slider 40 is arranged to slule to and. fro

on thecontaets of the resistance .39 which consists of a series of approximately equal resistanccs, The galvanonieter t arranged in series-with the line between the variable resistance and the earth plate The needle,

{11 of the galvanon'leter has an arm which [carries two contacts at l and 43 adapted to clip into the mercury cups. 4-5 antl 47. The contact 4&2 is made longer than the contact point 43 so that it will make connection with its mercury cup before the contact 43 (ices.

contact- 48 controls the relay' ltl, In the po sition shown the two contacts are raised clear of their mercury cups and 1:1 this position the switch arms 5 anti- 6 of the relay are arranged. so that the arm 0 which is held in this posltion lay a spring or by gravity completes the circuit of the battery 7 through theielectri'c motor t9, ancl thereby decreases the resistance of the line by operating'on the slider of the variable resistance 39. When the resistance ofthe line as a whole has been so'far reduced that the galvanonieter needle 4-1 has brought the con tact 42 into contact with the mercury in the cup 4'5, the swltch arm 5 is brought into its open circuit position and the'motor thereby stopped, Should the current in the line increase still-further the needle 4:1 will turn. i3

still more and bring the contact into Contact withits mercury cup. The closing of this circuit will bring the switch arm 6 from its normal open circuit posit-ion as shown into its closed circuit position [against the action of a spring or other controlling force and thereby operate the nu tor t9 in the opposite d rection and thus increase once more the resistance of the line.-

Instoad. of adding a.resistance in series on the line the slider 1-0 may be made to act on a resistance in shunt of a galvanometer or of any suitable receiver or even on one of the arms oi: a Wheatstone bridge. ..'he auto regulator just described could not evidently he used "for alternating currents unless it were autoxnatimlly interpolated at regular limes, which. times must take place synchronously With'the frequency of the alternations of the current in the circuit.

.1 declare that what I claim is:

1. An automatic resistance controller for .t'clegraph lines comprising in. combination a resistance in circuit with-the line, a slider adapted to more to and fro along the resistance, a galvanometer in series with the line, two relays operated b the galvanoinctr-r, an arm connected. to tlie handle of the galvanoineter, twicontact points on the saitl arm electrically connected to the coils of the two relays respectively, two contact cups adapted to operate with the Saizi contact points, one cup being arranged to incite con tact with its correspondingeontac i point before the other, an electric battery connected to the said contact cups, and the other ends of the coils of the relays, and means operated. by the relays for movingthe-slider'in one or other direction along the resistance.

An automatic resistance controller for telegraph lines comprising in. combination an additional resistance connected at one entl to one part of the line, a slider connected to-the other part of the line adapted to make contact withlhe' resistance at (lifferent parts of the same, a reversible motor adapted to move the slider in one or other direction, two relays operating switches for the motor, one switch normally closed being adapted to be opened by one relay, a second switch normally open being adapted to be closed by the other relay, a galvanometer in series With the line, an arm connected to the galvanomcter needle, two contaet points on the said arm electrically connected to the coils of the relays, two contact cups adapted to operate with the said contact points, one cup being arranged to make contact with its 0 responding contact point before the other, and an electric battery connected to the said contact cups and to the other ends of the coils of the relays.

In witness whereof, I have hereunto signed my name thi 7th day of November 1911, in the presence of two subscribing Wit- 20 ncsscs.

EDOUARD BELIN.

Witnesses Arz'roxm ltlon'rmnnn'r,

H. C. Coxn. 

